Fire protection of a fan casing made of composite

Patent metadata

Field	Value
Publication number	US-2016333789-A1
Application number	US-201515110391-A
Country	US
Kind code	A1
Filing date	Jan 8, 2015
Priority date	Jan 9, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

Method (S) for protecting against fire a fan casing ( 1 ) comprising a roughly cylindrical barrel ( 10 ) having a main direction extending along a longitudinal axis (X) and an upstream flange ( 20 ) extending radially with respect to the longitudinal axis (X) from an upstream end of the barrel ( 10 ), the fan casing ( 1 ) being made of a composite comprising a fibrous reinforcement densified by a matrix, said matrix being polymerized, the protection method(S) comprising the following steps:•—laying (SI) widths containing glass fibre pre-impregnated with a resin capable of affording the fan casing with thermal protection against fire on an upstream radial face ( 22 ) of the upstream flange ( 20 ), and•—polymerizing (S 2 ) the resin in order to obtain a protective layer ( 2 ).

First claim

1 . An fire protection method for a fan casing comprising an overall cylindrical barrel having a main direction extending along a longitudinal axis and an upstream flange radially extending relative to the longitudinal axis from an upstream end of the barrel, the fan casing being made of composite material comprising a fiber reinforcement densified by a matrix, said matrix being polymerized, the protection method comprising the following steps:
draping, on an upstream radial face of the upstream flange, panels comprising prepreg glass fibers with a resin capable of thermally protecting the fan casing against fire, and polymerizing the resin to obtain a protective layer.

2 . The protection method according to claim 1 , wherein supplementary panels are also draped on an outer face of the barrel.

3 . The protection method according to claim 1 , wherein supplementary panels are also draped on a top of the upstream flange.

4 . The method according to claim 1 , wherein supplementary panels are also draped against an inner face of the barrel, in a part adjacent to the upstream flange.

5 . The protection method according to claim 4 , wherein more supplementary panels are draped on the upstream radial face of the upstream flange than on the inner face of the barrel in the part adjacent to the upstream flange.

6 . The protection method according to claim 2 , wherein the supplementary panels are polymerized to form supplementary protective layers against fire, preferably at the same time as the panels are draped on the upstream radial face of the upstream flange.

7 . The protection method according to claim 1 , further comprising, following the polymerization step, a step during which an annular counter plate made of titanium is fixed on a downstream radial face of the upstream flange.

8 . The protection method according to claim 1 , wherein the resin comprises an epoxy resin, a phenolic resin and/or a cyanate ester resin, such as a resin of HexPly®M26T/50%035 type.

9 . The protection method according to claim 1 , further comprising a machining step of the upstream radial face of the upstream flange so as to adjust the thickness of the protective layer.

10 . The protection method according to claim 1 , the fan casing further comprising a downstream flange, and the method further comprises a step during which a barrier against galvanic corrosion is applied against a downstream surface of the downstream flange.

11 . The protection method according to claim 10 , wherein the Barrier against galvanic corrosion is applied according to the following steps:
draping, on a downstream radial face of the downstream flange, and optionally on the top, panels comprising prepreg glass fibers with a resin capable of protecting the fan casing, and polymerizing the resin to obtain a protective layer.

12 . A fan casing made of composite material comprising a fiber reinforcement densified by a matrix, said fan casing comprising an overall cylindrical barrel having a main direction extending along a longitudinal axis and an upstream flange radially extending relative to the longitudinal axis from an upstream end of the barrel, the fan casing being characterized in that it comprises a protective layer on an upstream radial face obtained as per a protection method according to claim 1 .

13 . The fan casing according to claim 12 , further comprising a downstream flange radially extending relative to the longitudinal axis from a downstream end of the barrel and a barrier against galvanic corrosion on a downstream radial face obtained via a protection method wherein the fan casing further comprises a downstream flange, and the method further comprises a step during which a barrier against galvanic corrosion is applied against a downstream surface of the downstream flange.

Assignees

• Snecma

Inventors

• Corradini Sylvain
• Elisseeff Timothee
• Essayan Sophie

Classifications

• F05D2240/15

  Heat shield · CPC title

• F02C7/25 Primary

  Fire protection or prevention (in general A62) · CPC title

• F05D2300/603

  Composites; e.g. fibre-reinforced · CPC title

• F04D29/526

  Details of the casing section radially opposing blade tips (ducts F04D29/545) · CPC title

• F01D25/24 Primary

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title